This week, Inc. editors and writers take us inside America's fastest-growing companies that topped this year's Inc. 500 list. Hear about a family chocolate company that made treats for politicians in Washington D.C., find out how a company that teaches groups how to paint scaled to a $55 million business, and get introduced to a specialty pharmacy in Pittsburgh that grew its revenue by over 13,000 percent by focusing on "orphan drugs" that treat patients with rare diseases.